This Solar Robot kit provides everything you need to build your own solar-powered motorized worm. Learn how motors and auto transmissions work, while following easy instructions and having fun. Includes solar cell, pre-punched wooden boards, gears, shafts, motor, and all necessary parts. Also has the option to power by battery, accepting one AA battery (not included). Use switch to select sun power or battery operation. Recommended for ages 10 and up. Maximum power in sunny direct sunlight conditions.